Preparation and characterization of Dy nanoparticles
Preparation and characterization of Dy nanoparticles
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DOI：
10.1063/1.123586
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发表时间：
1999-03
影响因子：
4
通讯作者：
N. Shevchenko;J. Christodoulides;G. Hadjipanayis
中科院分区：
文献类型：
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作者：
N. Shevchenko;J. Christodoulides;G. Hadjipanayis
通过在高压溅射下形成第一小金属颗粒，然后将它们嵌入溅射膜基质中，探索了纯纳米颗粒制备技术。使用串联沉积方法，其中溅射基质在5毫托的氩气压力下沉积，颗粒在1托压力下在专门设计的枪内形成，然后沉积。因此，减少了反应性和溶解性的颗粒基质组成限制。这项新技术应用于铝基体中的镝金属颗粒。观察到尺寸为4-12 nm的颗粒不存在反铁磁转变。4 nm的颗粒表现出超顺磁性，而较大的12 nm的颗粒表现出超过两倍大的大块材料在低温下的磁性。该技术的成功是通过能够对正常反应的镝-铝系统进行研究来证明的，防止了金属的存在。
A technique of pure nanoparticle preparation has been explored by forming first small metal particles under high pressure sputtering and then embedding them into a sputtered film matrix. The tandem deposition method is used where the sputtered matrix is deposited at an argon pressure of 5 mTorr and the particles are formed within a specially designed gun at a pressure of 1 Torr and then deposited. The particle-matrix compositional limitations of reactivity and miscibility are thus reduced. The new technique was applied to dysprosium metal particles in an aluminum matrix. The absence of the antiferromagnetic transition for particles with sizes of 4–12 nm was observed. The 4 nm particles behaved superparamagnetically, while the larger 12 nm particles showed coercivities over twice as large as that of the bulk material at cryogenic temperatures. The success of the technique is demonstrated by having been able to carry out the study on the dysprosium-aluminum system that normally reacts, preventing the existe...